Etymology

thy

T1H4Y4

Today it means: Only used in for thy, for-thy, which is an alternative form of forthy (“because, therefore”). Full definition →

Middle English þi ← Old English þīn ← Proto-West Germanic *þīn
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The story

  1. Proto-Indo-European · derived from*túh₂“thou”
  2. Proto-Indo-European · inherited from*téynos“thy; thine”
  3. Proto-Germanic · inherited from*þīnaz
  4. Proto-West Germanic · inherited from*þīn
  5. Old English · inherited fromþīn
  6. Middle English · inherited fromþi
  7. English todaythy

From Middle English þi, apocopated variant of þin, from Old English þīn, from Proto-West Germanic *þīn, from Proto-Germanic *þīnaz, from Proto-Indo-European *téynos (“thy; thine”), from Proto-Indo-European *túh₂ (“thou”). See thou.

Words from the same roots

Old Englishþīn all →

thine

Proto-West Germanic*þīn all →

thine

Proto-Germanic*þīnaz all →

thine

Proto-Indo-European*túh₂ all →

thouT-form

Etymology from Wiktionary, CC BY-SA 4.0.